Sheath for a case knife



FIG. 1 is a perspective view showing the front of the sheath for a case knife embodying my new design.

FIG. 2 is a left side view of FIG. 1, the right side view being a mirror image thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a sheath for a case knife, as shown and described. 